Compressor



Aug. 2 5, 1942. 1 w WFH-rE 2,294,352

COMPRESSOR Filed Nov. 19, 1938 2 Sheets-Sheet 1 24 40 /2 2+ Z322 Z6 /4 'L0 50 45 4,! 4

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Aug. '25, 1942. J. w. WHITE GOMPRES SOR Filed Nov. 19. 1938 2 Sheets-Sheet 2 INV EN TOR. daf/N M ivy/7E .A EZTORNEY.

patentes Aug. 2 5, i942 2,294,352

s Pli'rizru OFFICE llution of the rotor.

' 'UNITED `STATE coMPaEsson, I

.101m w. white, south nena, ma., assigner to Bendix Aviation Corporation, South Bend, Ind., a corporation oi' Delaware application November 19,1938, serial No. 241,301 (cazzo-45) iciaim.

'Ihis invention relates to compressors, and particularly to a rotary air compressor of the type comprising a working cylinder creasing within which is mounted eccentrically a rotor having a plurality of slots in which are adapted to slide varies that contact with the inner surface of the cylinder.

It is the principal object of provide certain improvements in such a compressor whereby its general eiliciency is enhanced. In the preferred embodiment of my invention there is provided a compressor, the variesl of which function to eifect the compression of the air or gas in two stages.

.Yet another object ofthe invention is to pro. vide a compressor ,of the above type wherein the reciprocable vanesthereof serve to compress the gas during the iirst revolution of the rotor, and again\serve to compress the same gas to a higher degree of compression during a subsequent revo- Yet another object of the invention is toprovide a compressor which is simple and compact in construction, eiilcient in operation and inexpensive to manufacture. y

Other objects of the invention and desirable details of construction and combinations of parts will become apparent from the following detailed description of certain embodiments of the invention, taken in conjunction with the accompanying drawings illustrating said embodiments, in which:

Figure 1 is a longitudinal sectional view of the compressor constituting a preferred embodiment of my invention;

Figure 2 is a transverse sectionalview yof the.VV

compressor disclosed in Figure 1, taken on the line 2-2 thereof;

' Figure 3 is a view, similar to Figure 1, disclos-v ing another embodiment of a two-stage commy invention to y.

pressor; and l Figure 4 is a transverse sectional view of the 'I'he rotor I4, which is eccentrically mounted' within the casing, is provided with radially disposed slots in which are slidably mounted vanes 22. A port 24 in the top of the casing provides what is termed a nrst inlet, and a port 26 in the 55 end wall Il provides a second inlet. A port 2t in the bottom of the'casing provides `what is termed a first outlet, and` a port 30 in the end wall.I6 provides a second outlet. Obviously, the construction might be altered to incorporate the second inlet and second outlet portsI in one -or the other of the end members I6 and 20. l

Describing now the .operation ofthis compres.

sor and, incidentally, completing the description Ithereof, during the first revolution and succeeding revolutions of the rotor I4, air, o'r other me-4 diiim to be compressed, is drawn' in the first inlet port u, the casinglz being naredat sz and pro:- vided with a lining I4 slotted.- as disclosed in Figure 1, to facilitate the flow of air. 'This airv is then compressed by the curved top walls of the moving vanes 22 and is forced out of the casing throughan outlet duct .36 and the'aforementioned first outlet port 26. Leaving the port 26, the compressed air enters a conduit 38, preferably wrapped closely about the casing I2. However, the air might also be passed through afduct, not shown, in the body of the casing.

Continuing the description of the'cycle of operations, the compressed air passes from the conduit 38 into the second inlet port 26, disclosed in Figurel, thence through an elongated duct 40 in the end plate I6 and into a compartment 42 in the uppermost slot below the uppermost vane 22. Such a compartment results from the outward movement of the vane, which is maintained in contact with the inside wall of the casing I2 by centrifugal force. With inward movement of theV aforementioned vane, that is, to a position nearer the center of the compressor, the compressed air in the compartment is further compressed and is then forced into at least one of the ports 44 in the inner wall of the rotor I4. The compressed air upon entering one of the ports 44 forces open a spring loaded ball check valve 46, the Iair then passing through a duct 46 and a port 56 in the shaft I6 and thence through a slot 62 in a sleeve 54 surrounding the shaft. From the slot 62 the compressed air passes into the second outlet port 20 and thence into a conduit 66 leading to a storage tank or other depository. As clearly disclosed in Figure 1, check valves 46 are housed within the ports 44 vand `are urged by springs 66 to seat upon members 66, threadedly mounted within` the ports. There is thus provided a rotary compressor wherein the vanes thereof serve to compress the same gas Vin two distinct stages, the construction and arrangement of the parts of the mechanism,-

. springs Il, being'such as to effect one stage of the compression during one revolution of the rotor and a second stage of the compression of the same gas with a succeeding revolution of the rotor. Referring to Figure 2, it will be noted that during the'kcounterclockwise travel of one of the vanes from the iirst inlet port 24 to its lowermost position the portion of gas located ,between two adjacent vanes is compressed during `the first revolution of the rotor and is then transmitted, through the conduit 38, back to the uppermost of the compartments 42. In all probability during the next succeeding revolution of the rotor, a large portion of the aforementioned portion of gas is again and further compressed,

probably during the inward movement of the -lowermost vane disclosed in Figure 2 from the position there shown.

'There is. disclosed Ain Figures 3 and 4 another embodiment ofmy invention. All of the parts of this mechanism are duplicates of those disclosed in Figures 1 and 2, and accordingly are given the same reference numerals. The compressor here disclosed diii'ers from the mechanism of Figui-,esl and 2 by the omission of -the check valves and cooperating ducts and ports in the shaft i6 and endwall Il and the substitutionintheirsteadofadiagonallyextendingsecond outlet duct t: in the end wan 2|. as clearly ldisclosed in these sures, this duct is positioned so as to receive the gas when the same is compressed to the maximum Although this invention has been described in connection with certain speciiic embodiments,

- the principles involved are susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope oi the appended claim.

Y I claim:

A rotor compressor comprising a casing havin end members,l a shaft extending through lthe casing and journalled in said end members eccen- .trically with respect to said casing, said shaft 4being ported at one of its ends to provide a receiving openings in the shaft and, together with the major portion of the inner walls of the casing, outlining a chamber, radially disposed vane members reciprocally mounted within the slots of said rotor member, and contactible with the inner walls of the casing. an inlet port in the upper part of 'said casing communicating with the aforementioned chamber, an outlet port in thelower part of said casing also communi-- eating with said chamber, an inlet port in the upper part of one of .the end members, a duct in said end member interconnecting said last mentioned port and the slots of the rotor when .the latter is moving, an outlet port in one of the end members, said port communicating with .the ports in said shaft, check valve members housed within the aforementioned valve receiving openings in the shaft and rotor and a conduit interconnecting said second mentioned inlet port with 35 the first mentioned outlet port.

JOHN W. WHITE. 

